<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.transitionbox{
				width: 100px;
				height: 100px;
				background-color: red;
				transition: 2s;
			}
			.transitionbox:hover{
				width: 3000px;
				height: 3000px;
			}
		</style>
	</head>
	<body>
		<div class="transitionbox" align="center" >别指我</div>
	</body>
</html>
